Journal Article

Luminous [O <span class="smallCaps">iii</span>] and [N<span class="smallCaps">ii</span>] from tidally disrupted horizontal branch stars

Drew Clausen, Steinn Sigurdsson, Michael Eracleous and Jimmy A. Irwin

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 424, issue 2, pages 1268-1274
Published in print August 2012 | ISSN: 0035-8711
Published online August 2012 | e-ISSN: 1365-2966 | DOI:
Luminous [O iii] and [Nii] from tidally disrupted horizontal branch stars

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We model the emission lines generated in the photoionized debris of a tidally disrupted horizontal branch (HB) star. We find that at late times, the brightest optical emission lines are [N ii] λλ6548, 6583 and [O iii] λλ4959, 5007. Models of a red clump HB star undergoing mild disruption by a massive (50–100 M) black hole (BH) yield an emission-line spectrum that is in good agreement with that observed in the NGC 1399 globular cluster hosting the ultraluminous X-ray source CXOJ033831.8−352604. We make predictions for the ultraviolet emission-line spectrum that can verify the tidal disruption scenario and constrain the mass of the BH.

Keywords: black hole physics; globular clusters: general; galaxies: individual: NGC 1399

Journal Article.  5524 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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